Saw gauge



June 28, 1932. VT. 1 BRADFORD I 1,864,634

SAW GAUGE Filed Nov. 27, 1929 l x l" M im Wlfflllwf Patented June 28,1932 's UNITED ls'r-A-TlasA PATENT OFFICE THOLVIAS J. BRADFORD, OFCOTTAGE GROVE, OREGON, ASSIGNOR F TWO-FIFTHS TO EMMITT SHARP, 0F COTTAGEGROVE, OREGON SAW GAUGE Application led November 27, 1929. Serial No.410,159.

My present invention vhas reference to a gauge for gauging the pitch orswage of the teeth of saws, and my object is the provision of a gauge tobe used in the sharpening of 1 cross cut saws and which will accuratelyand which is characterized by simplicity in con struction, cheapness inmanufacture and ease and accuracy in operation.

To the attainment of the foregoing and other objects which will presentthemselves, Y 5 the improvement resides in certain other novel featuresof construction, combination and operative association of parts, onesatisfactory embodiment of which is illustrated by the accompanyingdrawing.

In the drawing:

Figure 1 is atop plan view of a saw tooth gauge in accordance with thisinvention, the front plate for the top thereof being removed.

Figure 2 is a sectional view on the line 2--2 of Figure 1.

Figure 3 is a detail horizontal sectional view approximately on the line3-3 of Figure 2.

My improvement contemplates the employment of a preferably metal casingwhose rear portion describes a cylinder 1 and whose forward portion 2 isof a' less width thanthe rear 1 and has its sides converging toward itsouter rounded end. Fixed to the flat bottom of the cylindrical portion 1there are spaced legs 3 which rest upon the saw 4 whose teeth are to begauged. The reduced and neck portion 2of the cylinder, adjacent to thefront end thereof has passed through a suitable opening in its bottom apin 5 that provides the micrometer actuator. The pin at its top isformed with a head 6' and the inner corner of the said head is beveled,as at 7. The pin has a reduced portion 8 in which is received the offsetend provided atthe lower portion with a bent plate which I will term apost. The part 9 of the post 10 limits both the upward and outwardmovement of the pin 5. The inner and upper end of the post is alsoformed with an angle extension 12,

Y tinction which has its outer end concaved, as at 11, to receivetherein and aord a guide for the pin 5. Also the lower arm or extensionk9 of the post has its end conca-ved and is in contact with the reducedportion 8 of the pin and thus serves as an additional guide for the saidpin. The top of the bent plate whichl have termed the post 10 is formedwith a depressed rounded portion 13 and is provided with ears 14 at theends of the said depressed portions. The depressed portion 13 afords aseatfor a substantially U-shaped part or eye 15 on a tiltable arm 16.The arm -is in the nature of a plateand the rear thereof is disposed atan angle with respect to the eye 15 thereof and the forward portionabove the eye is preferably thickened, as at 17 ,Y and rests directlyupon the head 6, adjacent to the beveled corner thereof.

The angle end of the arm 16 merges into a round portion or eye 18 whichis engaged by Similar round portions or eyes 19 on the end of a bar 20.The spaced eyes 19 are preferably connected at their lower portions tothe plate by a transverse part 21 and there is passed through thealining eyes a pivot 22; The bar passes through the dividing wallbetween the cylindrical portion 1 and the nose extension 2 of thecasing, and the rear portion of the bar 20 is given a half twist so thatits said rear portion will be disposed over the flat bottom of the part1 of the casing. This flat portion is indicated for disby the numeral 23and is formed on one of its ed es with rack teeth 24 and is guided belowa nger 25 provided on one end of a bearing plate 26 which is fixed by anelement 27 to the bottom of the cylindrical portion of the casing. Theelement 27 is preferably in the nature of a bolt or screw and holdsthereon one end of a coil spring 28 whose second end is fixed to theflat portion 21 of the bar 20. There is journaled in the bearing plate26 and also journaled through the top ofthe part 1 of the'casing a shaftor arbor 29'that has fixed thereon and arranged between upper and lowerflanges 30, respectively a toothed wheel or pinion V31 that is in meshwith a rack 24. The top of the shaft or arbor has fixed thereto apointer 32 and the top 33 and the cylindrical portion l of the casinghas inscribed thereon a dial 34 over which the pointer 32 moves. The top33 is preferably of colored glass, but the characters on the dial 34 arepainted to render the same clearly discernible. Both the top of the part1 of the casing as well as the pointer 32 may be received under 'atransparent disc (not shown). Y The improvement as disclosed by Fig-ure2 of the drawing is arranged upon the saw 4 so that the micrometeractuator or pin 5 is arranged over the outer edges of the teeth of thecylinder. By movi-ng the casing alo-ng the saw the pin 5 will be broughtagainst the several teeth of the saw and any inaccuracies with respectto the pitch of the teeth will be duly recorded on the dial. It will beapparent that any upward movement of the pin will cause the angle end ofthe arm 16 to swing in the direction of the post l0. This will impart alongitudinal as well as a partial swinging to the bar 2O and suchmovement will, of course,'cause the rack thereof to impart a lturningmovement to the shaft or aror v29, which causesvr the pointer to travelVvover the dial.

Obviously the graduations on the dial may Abe inscribed to permit of thegauge registering a fine and coarse adjustment, and the construction andadvantages of the improve- Vment will, it is thought, be understood andappreciated by those skilled in the art .to which such invention relateswithout Vfurther detailed description.

YHaving described the invention, I claim:

l. A saw tooth gauge comprising .a long casi-ng having depending footportions thereon to travel over the flat face of a saw and having a pinmovable through the bottom .adjacent to one end thereof for travel .overthe in the casing and having a portion which overlies the beveled edgeof the head, a pointer over the dial, an arbor for the pointer, andmeans actuated by the inward movement of the pin and the swinging of thepivoted member for turning the arbor and pointer, said means including abar which is pivoted to the end of the fulcrumed member and which isgiven a half twist to provide a straight extension .that has one edgeformed with teeth, a pinion on the arbor to engage with the teeth, aguide for the toothed end of the bar, and a spring for swinging the bartov Acause the toothed end thereof to engage with the pinion.

In testimony whereof I aiiiX -mv lsignature.

THOMAS J. BRA'DFoRD.

teeth of the saw, means limiting the movement of the pin in twodirections .and aswngable arm actuated by the movement of the pin, a barpivotally secured to the arm and having a right angle twisted portion,'arack on one of the edges of the said twisted portion,` said casinghaving a dial, `a pointer movable over the dial, an arbor for thepointer and journaled in the casing, a pinion on the arbor, flangedelements on the arbor at `the opposite sides of the pinion and receivingthe rack of the bar therebetween, and spring means influencing the rackto engage with the pinion. Y

2. A saw tooth gauge comprising a casing having upper and lower flatfaces, a gauge on the upper face of the casing and said casing havingdepending foot portions on its lower face to travel over the flat sideof a saw, a pin movable through the lower face of the casing, means inthe casing providing a dial and a stop for limiting the movement of thepin in two vertical directions, ahead on the inner end of the pinand'havi-ng a beveled edge, a pivoted member fulcrumed

